<http://schema.org/url>
<http://www.netdoctor.co.uk/ask-the-expert/aches-and-pains/a2528/no-one-knows-why-my-back-hurts/>
<http://www.netdoctor.co.uk/ask-the-expert/aches-and-pains/a2528/no-one-knows-why-my-back-hurts/>